Finding the Fourth Proportional to 424,405.17, 636,472.71 and 140,042.70

Step by Step Solution

1. Step 1: Write the proportion equation
   424,405.17 : 636,472.71 = 140,042.70 : x
2. Step 2: Convert to fraction form
   424,405.17/636,472.71 = 140,042.70/x
3. Step 3: Cross multiply
   424,405.17x = 636,472.71 × 140,042.70
4. Step 4: Simplify right side
   424,405.17x = 89,133,356,784.72
5. Step 5: Solve for x
   x = 89,133,356,784.72/424,405.17
6. Step 6: Final answer
   x = 210,019.49